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| author |   Toshi Kani <toshi.kani@hpe.com> | 2016-04-12 18:10:52 -0600 |
|---|---|---|
| committer |   Ross Zwisler <ross.zwisler@linux.intel.com> | 2016-04-14 09:01:47 -0600 |
| commit | cba2e47abcbd80e3f46f460899290402f98090ec (patch) | |
| tree | 023dc101fde300f6fddb72eae60a5017b643a4c9 /include | |
| parent | Linux 4.6-rc3 (diff) | |
| download | linux-dev-cba2e47abcbd80e3f46f460899290402f98090ec.tar.xz linux-dev-cba2e47abcbd80e3f46f460899290402f98090ec.zip | |
pmem: fix BUG() error in pmem.h:48 on X86_32
After 'commit fc0c2028135c ("x86, pmem: use memcpy_mcsafe()
for memcpy_from_pmem()")', probing a PMEM device hits the BUG()
error below on X86_32 kernel.
kernel BUG at include/linux/pmem.h:48!
memcpy_from_pmem() calls arch_memcpy_from_pmem(), which is
unimplemented since CONFIG_ARCH_HAS_PMEM_API is undefined on
X86_32.
Fix the BUG() error by adding default_memcpy_from_pmem().
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/pmem.h | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/include/linux/pmem.h b/include/linux/pmem.h index ac6d872ce067..57d146fe44dd 100644 --- a/include/linux/pmem.h +++ b/include/linux/pmem.h @@ -72,6 +72,18 @@ static inline void arch_invalidate_pmem(void __pmem *addr, size_t size) } #endif +static inline bool arch_has_pmem_api(void) +{ + return IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API); +} + +static inline int default_memcpy_from_pmem(void *dst, void __pmem const *src, + size_t size) +{ + memcpy(dst, (void __force *) src, size); + return 0; +} + /* * memcpy_from_pmem - read from persistent memory with error handling * @dst: destination buffer @@ -83,12 +95,10 @@ static inline void arch_invalidate_pmem(void __pmem *addr, size_t size) static inline int memcpy_from_pmem(void *dst, void __pmem const *src, size_t size) { - return arch_memcpy_from_pmem(dst, src, size); -} - -static inline bool arch_has_pmem_api(void) -{ - return IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API); + if (arch_has_pmem_api()) + return arch_memcpy_from_pmem(dst, src, size); + else + return default_memcpy_from_pmem(dst, src, size); } /** |